============================================================================ Ubuntu Security Notice USN-2458-3 January 27, 2015 firefox regression ============================================================================ A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 14.10 - Ubuntu 14.04 LTS - Ubuntu 12.04 LTS Summary: USN-2458-1 introduced a regression in Firefox Software Description: - firefox: Mozilla Open Source web browser Details: USN-2458-1 fixed vulnerabilities in Firefox. This update introduced a regression which could make websites that use CSP fail to load under some circumstances. This update fixes the problem. We apologize for the inconvenience. Original advisory details: Christian Holler, Patrick McManus, Christoph Diehl, Gary Kwong, Jesse Ruderman, Byron Campen, Terrence Cole, and Nils Ohlmeier discovered multiple memory safety issues in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service via application crash, or execute arbitrary code with the privileges of the user invoking Firefox. (CVE-2014-8634, CVE-2014-8635) Bobby Holley discovered that some DOM objects with certain properties can bypass XrayWrappers in some circumstances. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to bypass security restrictions. (CVE-2014-8636) Michal Zalewski discovered a use of uninitialized memory when rendering malformed bitmap images on a canvas element. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to steal confidential information. (CVE-2014-8637) Muneaki Nishimura discovered that requests from navigator.sendBeacon() lack an origin header. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to conduct cross-site request forgery (XSRF) attacks. (CVE-2014-8638) Xiaofeng Zheng discovered that a web proxy returning a 407 response could inject cookies in to the originally requested domain. If a user connected to a malicious web proxy, an attacker could potentially exploit this to conduct session-fixation attacks. (CVE-2014-8639) Holger Fuhrmannek discovered a crash in Web Audio while manipulating timelines. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to cause a denial of service. (CVE-2014-8640) Mitchell Harper discovered a use-after-free in WebRTC. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to cause a denial of service via application crash, or execute arbitrary code with the privileges of the user invoking Firefox. (CVE-2014-8641) Brian Smith discovered that OCSP responses would fail to verify if signed by a delegated OCSP responder certificate with the id-pkix-ocsp-nocheck extension, potentially allowing a user to connect to a site with a revoked certificate. (CVE-2014-8642) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 14.10: firefox 35.0.1+build1-0ubuntu0.14.10.1 Ubuntu 14.04 LTS: firefox 35.0.1+build1-0ubuntu0.14.04.1 Ubuntu 12.04 LTS: firefox 35.0.1+build1-0ubuntu0.12.04.1 After a standard system update you need to restart Firefox to make all the necessary changes. Package Information: https://launchpad.net/ubuntu/+source/firefox/35.0.1+build1-0ubuntu0.14.10.1 https://launchpad.net/ubuntu/+source/firefox/35.0.1+build1-0ubuntu0.14.04.1 https://launchpad.net/ubuntu/+source/firefox/35.0.1+build1-0ubuntu0.12.04.1